Using the headless command line tool (soffice) to convert from PowerPoint to PDF

How does one specify arguments such as color, slide-per-page, etc. Thanks in advance!

There seem to be no further options to enhance output when convert from the commandline.
Works for me:

libreoffice -env:UserInstallation="file://${tmp}" -headless --convert-to pdf "${file}"

Trying to convert files with password protection silently fails.